EP 2006643 A2 20081224 - OPTICAL ENCODER
Title (en)
OPTICAL ENCODER
Title (de)
OPTISCHER CODIERER
Title (fr)
CODEUR OPTIQUE
Publication
Application
Priority
- JP 2007055247 W 20070315
- JP 2006076236 A 20060320
Abstract (en)
An optical encoder, with a simple structure, that can output a high-precision origin signal is provided. Rotary origin phase slits (112), which are formed into a pattern of linear slits arranged in parallel at equal pitches, are prepared for a rotary disk (110), while fixed origin phase slits (122), which are formed into a pattern of linear slits arranged in parallel at equal pitches, are prepared for a fixed origin phase scale (120). Light emitted by a light source (130) passes through an ejection window (121) and irradiates the rotary origin phase slits (112). The light reflected at the rotary origin phase slits (112) passes through the fixed origin phase slits (122) and is detected by a light-receiving element (140). Then, based on the detection signal, an origin signal is generated.
IPC 8 full level
G01D 5/36 (2006.01)
CPC (source: EP KR US)
G01D 5/00 (2013.01 - KR); G01D 5/3473 (2013.01 - EP US); G01D 5/36 (2013.01 - KR); G01D 5/366 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 2006643 A2 20081224; EP 2006643 A4 20131127; EP 2006643 A9 20090722; CN 101405576 A 20090408; CN 101405576 B 20101222; JP 4678553 B2 20110427; JP WO2007108398 A1 20090806; KR 20080095911 A 20081029; TW 200804770 A 20080116; US 2009321621 A1 20091231; US 8148674 B2 20120403; WO 2007108398 A1 20070927
DOCDB simple family (application)
EP 07738697 A 20070315; CN 200780009965 A 20070315; JP 2007055247 W 20070315; JP 2008506271 A 20070315; KR 20087022852 A 20080919; TW 96109521 A 20070320; US 29386207 A 20070315